Abrading machine



A. N. EMMONS ABRADlNG MACHINE Dec. l2, 1933.

Filed Ilarch 20, 1951 lI l,

LI@ )l ,eD-OO u 2 Sheets-Sheet 1 ATTORNEYS.

A. N. EMMONS ABRADING MACHINE Dec. l2, 1933.

Filed March 20, 1931 2 Sheets-Sheet 2 WW @W1/f ATTORNEYS ENTOR BZK f 7% Patented Dec. 12, 1933v UNITED STATES f PATENT oFFlcE ABRADING MACHINE Application March zo, 191. serial No. 524,017 z Claims. (o1. 511'z4) This invention relates to abrading machines, and has for its object, a particularly simple and ecient abrading roller construction, whereby the roller distorts or bulges and attens out of a cylindrical curve when pressure is applied to the roller, for the purpose of projecting a front portion of the roller forwardly in order that the abrading operation may be performed. up nearer a wall, vand leave a smaller unfinished surface than when the rollers heretofore used are employed, and Without the use of an additional element or nose in front of the roller.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings, in which like characters designate-corresponding parts in all the views.

zo Figure 1 is a fragmentary elevation of a portable abrading machine embodying this invention.

Figure 2 is an enlarged sectional view through the roller, the contiguous portion of the support' rollers 2, 3, the front roller being carried by ak frame or vcarriage 4 having a guide 5 movable in a guide passage 6 formed .in a block yI rigid with the main frame 1, the carriage being' pressed forwardly by means of a spring B and being adjusted by means of a nut 9 screwing on the threaded end of a stem 10 extending axially into the passage 6 and secured at 11 to the end of theguide 5. The spring 8 encircles the rod or stem 10. The front roller 2 is mounted on an axle 12 supported at one end by the carriage or frame 4, and capable of a slight angular adjustment, it being shown as pivoted at one end at no 13 to the frame or carriage 4, and as adjustable within limits about its pivot for alining the roller to cause the belt to run straight by means of an arm 14 fixed to the end of the axle 12 and adjustable by means of a thumb screw 15. The rear roller 3 is mounted on a suitable axle 16 supported by the frame 1 and is actuated through suitable motion' transmitting means from an electric motor mounted on the frame, which motor is housed within a casing 17.. The body is provided with a suitable handle 18 at its rear 60 end, andwith'a knob or handle 19 at its front end.

20 is an abrading belt which runs over the rollers. The body is supported on the floor, or other surface, by any suitable means as rests 21 and 22. The rear roller is mounted in the frame so that it, and the portion lof the belt lrunning around it, is elevated slightly off the floor. The construction thus far described, with the exception of the rest 22, forms no part of this invention;

Herelofore, in order that a machine of this character may work up close to a. wall, an additional small roller has been provided below and in advance of the front roller corresponding to the roller 2, or a shoe extending below and in front of the front roller 2 has been employed, so that a nose is provided at the front end of the machine, around which the abrading belt runs.'

This invention consists of a front roller -construction, whereby the roller is yieldable and distortable, and capable of flattening when pressure is applied'thereto, in order that its periphery mayy distort out of a cylindrical curve, so that the front lower portion is flattened and distorted or bulged forward and rearwardjcarrying .the abrading belt therewith; andthe belt can work closer upl to the edge of the fioor against a wall.

The roller 2, as here shown, comprises acen-A tral tubular or hubportion 25 having suitable bearings or bushings mounted on the axle 12, and an outer portion 26 of yielding means, this outer portion being preferably formed of distortable material, as rubber, which will compress anddistort and flatten when pressure is applied. to'the roller, as shown in Figure 1, although instead of 95 rubber, any other suitable means or material may vroller 2 to ordinarily apply'pressure to the underlying portion of the belt, and hold the underlying portion of the belt a'gainst the floor, or other surface. This foot is carried by the carriage 4 and rigid therewith, and is provided with a cross bar nl.

to permit a limited crushing or distorting of the 27, over which the upper run of the belt runs, the cross bar being provided with a shallow channel 28 for guiding the belt, or the upper run thereof. The shoe 22 is of sumcient height over the belt as seen in Figure 1, he can bear down heavier on the knob or handle 19, causing the roller 2 to distort and flatten, as shown in Figure 1, so that the roller'will press the abrading belt up fairly close to the wall, or the molding 29, leaving a minimum margin to `be finished by hand.' Of course, during they normal operation, pressure can be applied to the roller 2 by means of the knob or handle 19 to cause it to distort, but the distortion is primarily of importance when working up close o a wall.

What I claim is:

1. A portable abrading machine of the type described including a frame, a rear roller journalled in the'frame and extending transversely thereof,

'a carriage supported by the frame and being movable axially of the frame toward and from the rear roller, a second roller journalled at the forward end of said carriage and extending transversely of the frame, said second roller being of lesser diameter than the rear roller and being formed in part of suflicient yielding material and being capable while the machine is in operation of flattening out on the surface being finished so that the flattened portion is of greater width than the radius of the roller, an abrading belt trained over the rollers, a presser shoe carried by the carriage behind and adjacent the forward roller and having its lower side contacting with the lower run of the abrading belt, and means for actuating the rear roller.

2. A portable abrading machine of the type described including a frame, a rear roller journalled in the frame, a carriage supported at the forward end of the frame and being movable axially of the frame toward and from the rear roller, a forward roller journalled to the carriage, an abrading belt trained about the rollers, a presser shoe also carried by the carriage behind and adjacent the forward roller and having its lower side in contact with the lower run of the abrading belt, a rest secured to the rear of the frame for supporling the sameand the rear roller from the surface being finished, and means carried by the frame for actuating the rear roller.

ARTHUR N. EMMONS. 

